bc: suppress try_depth around speculative compile-time fold prim call #136

Job	Run time
ubuntu-24.04	10s
ubuntu-24.04-arm	10s
windows-2022	43s
macos-14	8m 26s
cross-compile (stencil-fresh on every target)	0s
external-test-suite (clojure-test-suite)	-1s
perf-gate (linux)	-1s
	9m 27s

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